If you only had one adjuster on the bottom, then someone has changed your brakes from the original Huck to Bendix.
Or maybe the Vehicle Info Kit for 1952 is incorrect. GM went to Bendix brakes in '53 on all but the rear of the larger 1-1/2 and 2-ton trucks if I'm reading the fuzzy 1953 Vehicle Info Kit correctly. Definitely that way on the 1954 trucks.

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.